Strain insulator



. Sept. 23 1924.

- A. o. AUSTIN STRAIN INSULA'I'OR Filed April 10 1919 2 Shouts-Shut 2 Patented Sept. 23, 1924. 1,509,219

UNITED STATES PATENT oF-FicE.

ARTHUR O. AUSTIN, OF BARBERTON, OHIO. ASSIG'NDR, BY MESNE.=ASSIGNMENFS, EEG THE OHIO BRASS COMPANY, OF MANSFIELD, OHIO, A CORPORATION OF NEW JERSEY.

STRAIN INSULATOR.

Application filed April 10, 1919. Serial No. 259,089. To all wliomiilwmay concern: longitudinal axis of said insulator body. 65

Be it known that I, ARTHUR O. AUsTiN, Some of hese grooves, as will be noted more a citizen of the United States, and resiparticularly by reference to Fig. 3,:1resomedent of 'Barberton, in the county of Summit What deeper than the remaining rooves,

5 and State of Ohio, have invented certain and the deeper grooves are dispos (1 still new and useful Improvements in Strain Instantially diametrically opposite. "In my 60 sulators, of which the following is a specipreferred construction I provide four of fication. these deeper grooves, which are disposed My invention relates to strain insulators, substantially ninety degrees apart, so 'tha't more particularly adapted for high tension they may be said to be disposedjin p'aii's purposes, and one of the objects of my inat right angles. The insulator body also 65 vention is to provide an improved strain has a pair of holes '3, one holecorrespondinsulator of this character which is easy ing to each pair of diametrically opposed to aline and assemble, with parts having grooves, so that these holes'B open through clearance to increase the leakage path, and from one groove to the other groove drafalso to produce an insulator which is simmetrically opposed therefrom. Thus the 70 ple, durable and reliable in construction, axes of the holes 3 artist-substantially right and effectiveand efiici ent in operation. angles with respect toeach other. 7 Other objects of my invention will appear hese holes, of course, are-spaced 'apar't hereinafter. so that there is 'a body or quantity crin- In the accompanying drawingssulating material between them,'and are also 75 Fig. 1 is a View in elevation of a strain positioned atsome distahce'in froin'the ends insulator construction embodying my invenof the insulator 'body'A. The structure lalso tion. has a pair of loop terminal members ex; Fig. 2 is a view of said insulator taken tending in opposite directions from'said'infromthe same position as Fig. 1, showing sulator bodyA and beyohd theends thereof, so the body of insulator material in section. to which terminals are attached the guy- Fig. 3 is a transverse view partly in sec- 'wires or other devices with which the intion on line 3-3 of Fig. 1. sulato-r is to be used. Tnthe structure shown Fig. 4 is a slightly modified form 0011- in Figs. 1 U63, these loop terminals areccmstructed so as to adapt it for use in series posed of several parts connected together. with one or more of 'itskind. A rod 5 "for each terminal is bent iiitoa 'Fig. 5 is a view in elevation of a modi- 'V-shape, substantially as shown in Fi'g.2, fied form of strain insulator embodying my and both rods are passed through the holes 35 invention; and -3,'as shown, and pointed or directed in op- Fig. 6 is a sectional view showing addip'osite directions with resp ct to each other. 90 tional spacing means applied to the 0011- Each rod 5- p'ass es "through or is looped struction of Fig. 5. through the hole 3 which is h rthest from V y The structure shown in the drawing which the end toward which the ends of the rod 40 illustrates an embodiment ol my invention are pointed, thusinterlinking or interlockis designed more particularly for use in coning the loops with respect to each other. 95 motion with high tension systems of dis- These rodsproject radially, as shown clearly trihution of power, and is intended to be in Fig. 2, somewhat beyond the flanges or used wherever strain insulatorsare used, ribs2of theiinsulatorbody,andarethreaded such for instance, as the'in'sulating'of guy on their ends. The remaining portion of wires orthe dead-ndingof cables. each terminaldoop-inthe present structure 100 In the structure shown I provide an elon is formed the members or bars 6. @nc gated body A of insulating material, such of thesebarsorii'iembers 6 of each terminal as porcelain, which has" a"plurality of enters each of the' opp os'ed groovesof'a-paii grooves or channels 1 in its surface, these and rests at 7 against the 'bottom with of )5 grooves being "formed by a plurality of said groove at a'consitlerable distance frbm spaced ribs or flanges 2, running longitudithe end of the insulator body, and this" cornally of the insulator body and disposed responding "end of each of the members 6 substantially radially with respect to the is turned outwardly angularly -at8 are provided with a hole through which the corresponding e'ndof the V-shaped rod passes. Eachend of the V-shaped rod 5 has a nut 9 threaded onto it to hold the member 6 and bar 5 connected together in relative position. A lining 10 of some soft metal, such as lead. is sometimes provided for the purpose of affording a relatively soft seat for the ends 7 and V-shaped bars 5 so that they will adjust themselves more readily to the irregularities in the porcelain.

The reason for permitting the ends 7 of said bars or members 6 to rest against the body of the insulator is to prevent any great amount of relative movement between the insulatorbody and the terminal loops. and alsoto prevent the loop from collapsing or straightening out, so to speak, when strain ;is applied thereto. These members or bars 6 begin at the ends 7 to turn or curve outwardly in opposite directions so that as the member 6 leaves the end of the insulator body, it will be noted that there is a comparatively wide space 11 between the bars 6 and the bottom wall of the grooves 1.. This spacing extends substantially back to the ends 7 of the members 6,. which are a considerable distance in from the ends of the insulator body. These spaces 11 thus serve as comparatively wide air'gaps and greatly increase the insulating qualities, of the structure. It also lengthens the leakage path along the surfaces of the grooves 1 and: other surfaces of said insulating body between one loop terminal and the other. It Will be noted also thatthis advantage is also enhanced by allowing considerable space be tween said rods 5 and member 6, and the surfaces of the flanges or ribs 2, thus increasing the surface leakage inthis direction also.

The. bars or members 6 project consider ably beyond the ends of the insulator body and may be attached to the guy wires in any desired manner. In the construction shown their outer ends are brought into contact or engagement with each other, and are held together by the bolts and nuts 13. The end portions 14 extend somewhat beyond the clamping bolts and nuts 13. and are spaced apart to form a clevis and a bolt 15 is passed through these outer extreme end portions and held in place in any suitable inanner by; a cotter pin 16. The guy wires 17 may be attached to this clevis in any suitable-manner, such as by passing the guy wires 17 through the clevis in the form of a loop; asshownmore clearly in Fig. 1, and thetwo portions of the loopheld together by a band or ring 18.

1 In Fig. 4 are illustrated two of the improved'st'rain insulators connected in series so as to increase the total insulating effect. It would, of course, be possible simply to connect the clevis of one terminal of one insulator with the clevis of one terminal of another insulator and so provide a series arrangement, but I prefer instead of this to eliminate one of the clerises from each insulator and simply form a double loop, so

to speak. between the two insulating bodies A. This double loop, so far as each insulator itself is concerned. is the same as shown in Figs. 1 to 3. but instead of bring ing the outer ends of the member 6 together to form a clevis. the members 6 are formed on both ends alike. and these ends are connected, as in Figs. 1 to to the V shaped rods or members 5, as clearly shown in Fig. 4.

The portions of these bars or members 6". between the ends of the adjacent insu lators. are preferably straight and parallel with respect to each other. and are of suffioient length to properly space the insn lators apart. The end portions of these bars or members 6 are curved away from the bottom wall of the grooves exactly as in the case of the structure of Figs. 1 to 3 so as to provide the air gaps ll. In this manner. and by means of this construction, any number of insulators may be placed in series in accordance with the particular requirement.

The structure shown in Fig. 5 is a modification of those shown in the preceding figures, particularly in the manner of constructing the loop terminal members. The insulator body A is preferably constructed in the same manner, as in the preceding figures, but theterminal loops are formed by pieces of cable 20, or other material suitable for the purpose. These lengths of cable 20 are passed through the holes 3 in the insulating member A in the same manner as the bars 5 in the preceding figures. and are bent into a comparatively long U or V- shape. and their ends attached in any suitable manner to a cross member 2]. In the. construction shown the ends of these cable loops are doubled over and wedged into sockets 22 in said cross member, and the socket may then be filled with solder or other material, but this construction obviously maybe modified to suit requirements. The cross members 21 may be provided with clevises 23. as in the preceding figures. to which clevises the loop ends of the gov wires 17 may be attached. In anchoring the outer ends of the cable loop terminals 20' they should be spaced far enough apart at the ends of the insulator body, so as to provide the air space or air gap 11 between said cables and the bottom and side walls of the grooves l of the insulator body.

In the form shown by Fig. 5 it may be desirable to space the cable and insulator farther apart. and if so, a spacing member or sleeve 23. as shown by Fig. 6, may be employed, which is placed in position between the ribs 2 before the ends of the cable loops are secured to the cross member 21.

With the construction sh0\ 'n by Figs. l. to 4, the insulating members A and the connecting and terminal bars 6. 6", are held rigidly in alinement, the spacing distance 11 being maintained under all conditions so that the best insulating condition is always insured.

I claim 1. The combination with an elongated body of insulating material having a plurality of holes extending therethrough in a direction transverse to the direction of greatest length of said body and spaced from the endsthereof. of terminal members passingthrough said holes and extending in opposite directions beyond the opposite ends of said body. and means for spacing the extending portions of said terminal -.members from the lateral surface of said insulating body adjacent the ends thereof. 2. The combination with an elongated body of insulating material having a plurality'of holes extending therethrough in a direction transverse to the direction of greatest length of said body and spaced from theends thereof of terminal members passing through said holes and extending in opposite directions beyond the ends of said body, and means for spacing the extending portions of said terminal members from the lateral surface of said body adjacent the ends thereof to provide air gaps between said body and said terminal members.

3. The combination of an elongated body of insulating material having a plurality of ribs extending longitudinally thereof and forming grooves therebetween and having holes extending through said body transversely thereof and opening into said grooves at an angle. with respect to each other. and terminal members looped through said holes and extending along said grooves and beyond the ends of said body, means for spacing said terminal members from the walls of said grooves adjacent the ends of the body to provide air space between said terminal members and said body.

4. The combination of an elongated body of insulating material having a plurality of spaced longitudinal ribs or flanges extending longitudinally thereof and forming grooves therebetwecn and having a pair 0 holes extending through said body transversely to the direction of greatest length thereof and at a distance from the ends of said body and opening into said grooves at an angle with respect to each other, and a pair of terminal members having portions passed through said holes and leading longitudinally of said grooves away from and beyond the ends of the body in opposite directions means for spacing said terminal members from the walls of the grooves adjacent the corresponding ends of said body to provide air gaps between said terminal members and said body.

5. The combination with a longitudinally ribbed insulating member having transverse holes tbcrethrough at right angles to each other. and terminal members looped through said holes and extending beyond the ends of said insulating member in the direction of the grooves formed by said ribs. means for clamping the terminal members against the body of the insulating member at a distance in from the end thereof and means for spacing said members from the bottoms of the grooves at the end of the insulating member.

6. An insulator comprisinga plurality of longitudinally ribbed insulating members and terminal and connecting memberslinked together through said insulating members and means for rigidly clamping said members in the grooves formed by the ribs, the terminal and connecting members beingi' formed to extend entirely clear of the insulating members at and near the ends thereof. v

7. An insulator comprising a: plurality of longitudinally ribbed insulating members, and terminal and connecting means attached thereto, comprising bars which engage the insulating members in opposite grooves formed by the ribs at a distance from the ends of the insulating members and are spaced from surfaces of these membars at and near the ends thereof. and means for clamping opposite bars against the insulating members.

8. An insulator comprising a plurality of elongated insulating members, and terminal and connecting means attached thereto in longitudinal alinement. said means comprising bars engaging said members at a distance from the ends but extending beyond the ends and spaced from said members at and near the ends, and clamping means for engaging oppositely disposed liars and clamping them against the rnem heis.

9. In an insulator, the combination with a perforated elongated insulating member. of connecting means looped through a perforation in said insulating member and comprising a pair of connecting members arranged to engage the insulating member adjacent the opposite ends of said perforation only but spaced from all other parts of its surface, said connecting members extending. beyond one end of the insulating member, a connecting bolt extending through said perforation and attached to said pair of connecting members to hold them in place, and a pad of yielding material extending through said perforation under said bolt and disposed between said pair of connecting members and said insulating member.

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10. An insulating member comprising an elongated body with longitudinal ribs providing substantially straight grooves there between, together with attaching means secured to said insulating member placed in. the grooves between said ribs and spaced from said elongated body and ribs adjarent the end of said body to increase the length of leakage path with a given length of insulator.

11. An insulator comprising .an elongated body with radial insulating blades, and interlocking tension members separated by said blades, said members being in contact with said insulator body near the iongitudinally central portion of the insulating member only and extending in opposite directions from their respective points of con tact between said blades past the opposite ends of said body.

12. An insulator comprising interlocking tension members, and an elongated insulator body with radial projecting longitudinally extendin insulating vanes positioned between said tension members, said members being free from the vanes and body portion near the ends of said insulator to increase efl'ective insulation.

13. The combination with a dielectric member, of terminal members extending in opposite directions therefrom, said terminal members comprising outwardly bowed bars having inwardly projecting ends en aging said dielectric member at points space from the ends thereof for spacing the terminal members, extending in each direction, from the lateral surface of said dielectric member to increase the leakage path about the ends of said dielectric member.

14. In combination, an elongated dielectric member having longitudinally extending ribs, a pair of terminal members passing through openings in said dielectric member'and extending in opposite directions from said dielectric member and positioned in the grooves between said ribs, and means for spacing portions of said terminal members from the bases of said grooves, at each end of said dielectric member, said spacing means comprising inwardly projecting portions on said terminal members enga ing; said dielectric member at points spaced mm the ends thereof;

In testimony whereof I have signed my name to this specification, on this 3rd day of April A. D. 1919.

ARTHUR O. AUSTIN. 

